A current transformer open circuit prevention device and method of use thereof

Abstract

This invention belongs to the field of power protection technology and discloses a current transformer anti-open-circuit device and its usage method. It includes a housing assembly, two internal anti-open-circuit terminal modules, and two open-circuit signal terminal modules. Each anti-open-circuit terminal module includes a terminal interface assembly connected to the housing assembly, a terminal conductive assembly with its first end connected to the terminal interface assembly, and a terminal elastic member with its two ends connected to the terminal conductive assembly and the housing assembly, respectively. The second end of the terminal conductive assembly has a terminal contact. Each open-circuit signal terminal module includes a signal interface assembly connected to the housing assembly and a signal conductive assembly with its first end connected to the signal interface assembly. The second end of the signal conductive assembly has a signal contact. One of the signal conductive assemblies has an extension at its second end, which is connected to a signal elastic member and a thermoplastic insulating sheet. The other end of the signal elastic member is connected to the housing assembly to prevent open circuit on the secondary side of the current transformer.

Description

Technical Field

[0001] This invention relates to the field of power protection technology, and in particular to a current transformer anti-open circuit device and its usage method. Background Technology

[0002] Current transformers (CTs) are crucial devices for current measurement in power systems. Based on the transformer's operating principle, a current transformer converts a large primary current into a smaller secondary current through electromagnetic induction at a fixed ratio. Typically, current transformers are available in 1A and 5A rated secondary current values. Since the secondary side of a current transformer induces a current of 1A or 5A, its characteristics are equivalent to a constant current source. Therefore, when an open circuit or poor contact occurs on the secondary side, it is equivalent to connecting a large resistor in series in that circuit. According to Ohm's law, voltage = current × resistance. When the current is constant, an increase in resistance leads to an infinitely increasing voltage. When the voltage amplitude is sufficient to break down the open-circuit medium, arcing and equipment erosion will occur. Therefore, according to current transformer usage rules, it is strictly forbidden to operate a current transformer with its secondary side open. However, during maintenance work on the secondary circuit of a current transformer, accidental disconnection of connecting wires / plates leading to an open circuit frequently occurs, posing a significant hazard to personnel and equipment, and presenting a substantial potential risk. Summary of the Invention

[0003] The purpose of this invention is to provide a current transformer anti-open circuit device and its usage method, which solves the problem of the current transformer secondary side being open-circuited due to accidental disconnection of connecting wires / pieces, causing harm to personnel and equipment.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] On the one hand, a current transformer open-circuit protection device is provided, including a housing assembly, wherein the housing assembly contains:

[0006] Two open-circuit protection terminal modules are provided. Each open-circuit protection terminal module includes a terminal interface assembly connected to the housing assembly, a terminal conductive assembly with its first end connected to the terminal interface assembly, and a terminal elastic member with its two ends connected to the terminal conductive assembly and the housing assembly, respectively. The second end of the terminal conductive assembly is provided with a terminal contact.

[0007] Two open-circuit signal terminal modules are provided. Each open-circuit signal terminal module includes a signal terminal interface component connected to the housing assembly and a first signal terminal conductive component connected to the signal terminal interface component. The second end of the signal terminal conductive component is provided with a signal terminal contact. The second end of the first signal terminal conductive component is provided with an extension, which is connected to a signal terminal elastic element and a thermoplastic insulating sheet. The other end of the signal terminal elastic element is connected to the housing assembly.

[0008] A reset module, wherein the first terminal conductive component is connected to the reset module, and the extension passes through and is movably connected to the slot of the reset module;

[0009] In the first state, the two terminal contacts are isolated by the insulating sheet, and the two signal terminal contacts are spaced apart. In the second state, the two terminal contacts and the two signal terminal contacts are closed respectively.

[0010] In some possible implementations, four fixed shafts are also included, two of the terminal conductive components are correspondingly arranged and rotatably connected to the two fixed shafts, and two of the signal terminal conductive components are correspondingly arranged and rotatably connected to the other two fixed shafts.

[0011] In some possible implementations, the terminal conductive assembly includes a terminal flexible conductive element and a terminal conductive sheet connected to the terminal flexible conductive element. The terminal flexible conductive element is connected to the terminal interface assembly. The terminal conductive sheet is provided with the terminal contact. The terminal conductive sheet is rotatably connected to the fixed shaft.

[0012] The signal terminal conductive component includes a signal terminal flexible conductive element and a signal terminal conductive sheet connected to the signal terminal flexible conductive element. The signal terminal flexible conductive element is connected to the signal terminal interface component. The signal terminal conductive sheet is provided with the signal terminal contact. The first signal terminal conductive sheet is provided with an extension. The signal terminal conductive sheet is rotatably connected to the fixed shaft.

[0013] In some possible implementations, both the terminal interface assembly and the signal terminal interface assembly include a fastener connected to the housing assembly and a base disposed within the housing assembly, with an interface formed between the end of the fastener and the base, and the housing assembly having an opening communicating with the interface.

[0014] In some possible implementations, the reset module includes an operating element and a reset link slidably connected to the housing assembly. The operating element is disposed on the housing assembly, and the reset link is elastically connected to the housing assembly. The operating element is connected to a first end of the reset link, and a first terminal conductive component is connected to a second end of the reset link. The reset link is provided with the slot.

[0015] In some possible implementations, the housing assembly includes a base plate and a cover detachably connected to the base plate, the base plate and the cover forming a receiving space, the open-circuit protection terminal module and the open-circuit signal terminal module being disposed in the receiving space, and the base plate being used for connection to an external structure.

[0016] In some possible implementations, the two terminal interface assemblies are arranged opposite each other along a first direction, the two terminal contacts are arranged opposite each other along a second direction, the two terminal elastic elements are connected to the same side of the housing assembly, one of the two terminal elastic elements is in a compressed state and the other is in a stretched state.

[0017] In some possible implementations, the front end of the insulating sheet is in the shape of a fence.

[0018] In some possible implementations, the housing assembly is provided with an observation port, and the extension is connected to a sign that is exposed in the observation port.

[0019] On the other hand, a method for using the current transformer anti-open-circuit device as described above is provided, including:

[0020] Connect the current transformer open circuit protection device to the current transformer: the two terminal interface components are respectively connected to the two output terminals of the secondary side of the current transformer, and the two signal terminal interface components are respectively connected to the current transformer open circuit signal power supply terminal and the current transformer open circuit signal output terminal.

[0021] When the secondary side of the current transformer is open-circuited and the voltage amplitude generated between the two terminal interface components breaks down the isolation gap between the two terminal contacts, the current transformer anti-open-circuit device switches from the first state to the second state, the two terminal contacts close and provide a short-circuit loop for the secondary side of the current transformer, and the two signal terminal contacts close and issue an alarm signal.

[0022] Check whether the current between the two terminal interface components is the same as the secondary current of the current transformer to confirm whether the operation signal of the current transformer anti-open circuit device is correct.

[0023] After confirming that the current transformer anti-open circuit device has been activated, short-circuit the secondary side of the current transformer, check the secondary side circuit of the current transformer, and eliminate the fault.

[0024] The current transformer anti-open circuit device is reset using the reset module.

[0025] The beneficial effects of this invention are:

[0026] This invention provides a current transformer open-circuit protection device and its usage method. In use, the current transformer open-circuit protection device is connected to the current transformer. Two terminal interface components are respectively connected to the two output terminals of the current transformer's secondary side, and two signal terminal interface components are respectively connected to the current transformer open-circuit signal power supply terminal and the current transformer open-circuit signal output terminal. When the current transformer's secondary circuit is working normally, the current transformer open-circuit protection device is in a first state. When the current transformer's secondary side is open-circuited, and the voltage amplitude generated between the two terminal interface components breaks down the isolation gap between the two terminal contacts, the current transformer open-circuit protection device switches from the first state to a second state. The two terminal contacts close, providing a short-circuit loop for the current transformer's secondary side, and the two signal terminal contacts close and issue an alarm signal. This protects the current transformer and its connected equipment, avoiding harm to personnel and equipment, improving safety, and reminding personnel to perform timely maintenance to avoid affecting subsequent work. After the fault is repaired and eliminated, the current transformer's open-circuit protection device can be reset by resetting the reset module, enabling it to work again, achieving recycling and reducing costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a current transformer anti-open-circuit device provided in a specific embodiment of the present invention;

[0028] Figure 2 This is a front view of the housing assembly provided in a specific embodiment of the present invention;

[0029] Figure 3 This is an exploded view of the housing assembly provided in a specific embodiment of the present invention;

[0030] Figure 4 This is a top view of the housing assembly provided in a specific embodiment of the present invention;

[0031] Figure 5 This is a right view of the housing assembly provided in a specific embodiment of the present invention;

[0032] Figure 6 This is a left view of the housing assembly provided in a specific embodiment of the present invention;

[0033] Figure 7 This is a bottom view of the base plate provided in a specific embodiment of the present invention;

[0034] Figure 8This is a schematic diagram of an insulating sheet and one of the terminal contacts provided in a first state according to a specific embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the reset module provided in a specific embodiment of the present invention;

[0036] Figure 10 This is a flowchart illustrating the usage method of the current transformer anti-open-circuit device provided in a specific embodiment of the present invention.

[0037] In the picture:

[0038] 1. Anti-open-circuit terminal module; 11. Terminal interface assembly; 111. Fastener; 112. Base; 12. Terminal conductive assembly; 121. Terminal flexible conductive element; 122. Terminal conductive sheet; 1221. Terminal contact; 13. Terminal elastic element;

[0039] 2. Fixed shaft;

[0040] 3. Open-circuit signal terminal module; 31. Signal terminal interface assembly; 32. Signal terminal conductive assembly; 321. Signal terminal flexible conductive component; 322. Signal terminal conductive sheet; 3221. Signal terminal contact; 3222. Extension; 33. Signal terminal elastic component; 34. Insulating sheet; 35. Identification plate;

[0041] 4. Reset module; 41. Operating component; 42. Reset connecting rod; 421. Slot; 422. Slot; 43. Reset component; 44. Reset baffle; 45. Guide post;

[0042] 5. Housing assembly; 51. Base plate; 511. Lock hole; 512. Mounting hole; 52. Cover; 521. Observation port; 522. Lock; 523. Opening; 53. Sealing baffle. Detailed Implementation

[0043] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] Example 1

[0047] This embodiment provides a current transformer anti-open-circuit device, such as... Figures 1-9 As shown, the system includes a housing assembly 5. Inside the housing assembly 5 are two anti-open-circuit terminal modules 1, two open-circuit signal terminal modules 3, and a reset module 4. Each anti-open-circuit terminal module 1 includes a terminal interface assembly 11 connected to the housing assembly 5, a terminal conductive component 12 with its first end connected to the terminal interface assembly 11, and a terminal elastic member 13 with its two ends connected to the terminal conductive component 12 and the housing assembly 5, respectively. The second end of the terminal conductive component 12 is provided with a terminal contact 1221. Each open-circuit signal terminal module 3 includes a signal interface assembly 31 connected to the housing assembly 5 and a signal conductive component 32 with its first end connected to the signal interface assembly 31. The second end of the electrical component 32 is provided with a signal terminal contact 3221; wherein the second end of the first signal terminal conductive component 32 is provided with an extension 3222, the extension 3222 is connected to a signal terminal elastic element 33 and a thermoplastic insulating sheet 34, and the other end of the signal terminal elastic element 33 is connected to the housing component 5; the first terminal conductive component 12 is connected to the reset module 4, and the extension 3222 passes through and is movably connected to the slot 421 of the reset module 4; in the first state, the two terminal contacts 1221 are isolated by the insulating sheet 34, and the two signal terminal contacts 3221 are spaced apart; in the second state, the two terminal contacts 1221 and the two signal terminal contacts 3221 are closed respectively.

[0048] In use, the current transformer open-circuit protection device is connected to the current transformer. The two terminal interface components 11 are respectively connected to the two output terminals of the current transformer's secondary side, and the two signal terminal interface components 31 are respectively connected to the current transformer open-circuit signal power supply terminal and the current transformer open-circuit signal output terminal. When the current transformer's secondary circuit is working normally, the current transformer open-circuit protection device is in its first state. When the current transformer's secondary side is open-circuited, and the voltage amplitude generated between the two terminal interface components 11 breaks down the isolation gap between the two terminal contacts 1221, the current transformer open-circuit protection device switches from the first state to the second state. The two terminal contacts 1221 close, providing a short-circuit loop for the current transformer's secondary side, and the two signal terminal contacts 3221 close and issue an alarm signal. This protects the current transformer and its connected equipment, preventing harm to personnel and equipment, improving safety, and reminding personnel to perform timely maintenance to avoid affecting subsequent work. After the fault is repaired and eliminated, the current transformer open circuit protection device can be reset by resetting module 4, enabling it to work again, achieving recycling and reducing costs.

[0049] Working principle:

[0050] When the secondary circuit of the current transformer is operating normally, since the rated value of the secondary current is a fixed value, typically 1A or 5A, the peak value of its secondary voltage is determined by the resistance of the secondary circuit. The resistance value is generally small, therefore, there is a uniform voltage difference between the two open-circuit protection terminal modules 1 and all connected conductive components, while an insulating sheet 34 isolates them from the two terminal contacts 1221. Because the circuit resistance is small when the secondary side of the current transformer is operating normally, its secondary voltage value will not break down the isolation gap between the two terminal contacts 1221. Therefore, the current can flow normally in the secondary circuit of the current transformer, ensuring the normal operation of the measuring instruments in the secondary circuit of the current transformer.

[0051] When an open circuit occurs on the secondary side of the current transformer outside the device wiring terminal (away from the secondary side of the current transformer), an extremely high voltage will be generated on the secondary side due to the increase in the equivalent resistance of the secondary circuit. Therefore, the same level of high voltage will also be generated between the two anti-open-circuit terminal modules 1 and all conductive components connected to them. When the magnitude of this high voltage is sufficient to break down the isolation gap between the two contacts, a discharge spark will be generated in the gap, accompanied by high temperature heating. The thermoplastic insulating sheet 34 between the two terminal contacts 1221 softens upon heating. Since the insulating sheet 34 is connected to the first signal terminal conductive component 32, and the first signal terminal conductive component 32 is connected to the signal terminal elastic element 33, when the insulating sheet 34 softens upon heating, it is pulled out of the isolation gap between the two terminal contacts 1221 under the action of the signal terminal elastic element 33. At this time, the two terminal contacts 1221 quickly close under the action of the signal terminal elastic element 33, providing a reliable short-circuit loop for the secondary side of the current transformer.

[0052] Simultaneously, under the action of the elastic element 33 at the signal end, the heated and softened insulating sheet 34 is pulled out, accompanied by the movement of the conductive component 32 at the signal end. The movement of the conductive component 32 at the signal end causes the two signal end contacts 3221 to close. At this time, the two open-circuit signal end modules 3 are short-circuited, energizing the previously floating open-circuit signal output terminal of the current transformer, and transmitting the relevant signal to the computer backend to display the open-circuit signal alarm of the secondary side of the current transformer.

[0053] In one embodiment, such as Figure 2 and Figure 3 As shown, the housing assembly 5 includes a base plate 51 and a cover 52 detachably connected to the base plate 51. The base plate 51 and the cover 52 form a receiving space, in which the anti-open-circuit terminal module 1 and the open-circuit signal terminal module 3 are disposed. The base plate 51 is used to connect with external structures to facilitate the assembly of the internal structure. Further, the base plate 51 has a locking hole 511, and the cover plate has a latch 522. The latch 522 locks into the locking hole 511 to lock the cover 52 onto the base plate 51. Further, the housing assembly 5 also includes a sealing baffle 53 fixed to the base plate 51. The sealing baffle 53 is embedded in the cover 52, which on the one hand limits the installation of the cover plate by the sealing baffle 53 to ensure installation accuracy, and on the other hand achieves a sealed connection to ensure sealing performance. Further, the base plate 51 has a mounting hole 512, through which bolts pass and connect to external structures such as mounting brackets to achieve the installation and fixation of the current transformer open-circuit device.

[0054] In one embodiment, such as Figures 4-6As shown, both the terminal interface assembly 11 and the signal interface assembly 31 include a fastener 111 connected to the housing assembly 5 and a base 112 disposed within the housing assembly 5. An interface is formed between the end of the fastener 111 and the base 112, and the housing assembly 5 has an opening 523 communicating with the interface. The connection end of the current transformer passes through the opening 523 and extends into the interface. The end of the fastener 111 presses the connection end against the base 112 for fastening, ensuring tight contact between the connection end and the interface assembly, thus improving reliability.

[0055] In one embodiment, such as Figure 1 , Figure 4 and Figure 7 As shown, the current transformer anti-open circuit device also includes four fixed shafts 2 fixed to the housing assembly 5. Two terminal conductive components 12 are correspondingly arranged and rotatably connected to the two fixed shafts 2, and two signal terminal conductive components 32 are correspondingly arranged and rotatably connected to the other two fixed shafts 2. The conductive components are fixed and rotated through the fixed shafts 2.

[0056] In one embodiment, such as Figure 1 As shown, the terminal conductive assembly 12 includes a flexible conductive member 121 and a conductive sheet 122 connected to the flexible conductive member 121. The flexible conductive member 121 is connected to the terminal interface assembly 11. The conductive sheet 122 has a terminal contact 1221 and is rotatably connected to the fixed shaft 2. The end of the conductive sheet 122 is flexibly connected to the terminal interface assembly 11 through the flexible conductive member, ensuring that it can always be connected to the terminal interface assembly 11 whether it is rotating or not. Similarly, in one embodiment, the signal terminal conductive assembly 32 includes a flexible conductive member 321 and a conductive sheet 322 connected to the flexible conductive member 321. The flexible conductive member 321 is connected to the signal interface assembly 31. The conductive sheet 322 has a signal contact 3221, wherein the first conductive sheet 322 has an extension 3222 and is rotatably connected to the fixed shaft 2. Furthermore, the flexible conductive component is a flexible conductive copper braided strip, the conductive sheet is a copper sheet, the insulating component is a copper sheet with an external insulating coating, and the elastic component is a spring.

[0057] In one embodiment, such as Figure 8 As shown, the front end of the insulating sheet 34 is fence-shaped, which reduces the structural size and makes it easier to deform.

[0058] In one embodiment, such as Figure 1 and Figure 2As shown, the housing assembly 5 has an observation port 521, and an extension 3222 is connected to an identification plate 35. The identification plate 35 is exposed in the observation port 521 and can move with the extension 3222. When exposed in the observation port 521, it is convenient to observe the current status. Furthermore, the identification plate 35 has two colors. In the first state, the first color of the identification plate 35 is exposed in the observation port 521, and in the second state, the second color is exposed in the observation port 521, making it easy to distinguish the status. When the reset module 4 is used to perform an operation reset, the identification plate 35 moves accordingly, and the observation port 521 changes color, indicating that the reset was successful.

[0059] Furthermore, install the current transformer open-circuit protection device before the current transformer. Use a multimeter in buzzer or resistance mode to measure the two terminal interface assemblies 11 to ensure that the resistance between the two terminal interface assemblies 11 is infinite, indicating an open state. Otherwise, check if the indicator 35 of the position observation port 521 has changed color. If it is not open, use the reset module 4 to reset it. Use a multimeter in buzzer or resistance mode again to measure the two terminal interface assemblies 11 to check if the two terminal interface assemblies 11 are open. If not, replace the current transformer open-circuit protection device until the current transformer open-circuit protection device is guaranteed to work normally.

[0060] In one embodiment, such as Figure 1 and Figure 9 As shown, the reset module 4 includes an operating element 41 and a reset link 42 slidably connected to the housing assembly 5. The operating element 41, such as a reset button, is located on the housing assembly 5. The reset link 42 is elastically connected to the housing assembly 5. The operating element 41 is connected to the first end of the reset link 42, and the first terminal conductive component 12 is connected to the second end of the reset link 42. The reset link 42 has a slot 421. Pressing the reset button causes the reset link 42 to move the terminal conductive component 12 and the extension 3222. Further, the reset module 4 also includes a reset baffle 44 and a reset element 43. The reset baffle 44 is connected to the reset link 42, and the reset element 43, such as a spring, is connected between the housing assembly 5 and the reset baffle 44. After releasing the reset button, the reset element 43 causes the reset link 42 to reset. The slot 421 is elongated, and the extension 3222 can move along the length of the slot 421. The end of the reset link 42 is provided with a slot 422, and the terminal conductive component 12 is engaged in the slot 422. Furthermore, the reset module 4 also includes two guide posts 45, and a guide groove is formed between the two guide posts 45. The reset link 42 moves under the joint constraint of the guide groove and the hole in the housing component 5.

[0061] When the device is in a short-circuit state, the first terminal conductive component 12 is positioned near the second end of the slot 421 of the reset link 42. The second terminal conductive component 12 and the extension 3222 move simultaneously with the reset link 42, while the reset member 43 is compressed. When the reset button is pressed, the reset link 42 moves the second terminal conductive component 12, causing the two terminal contacts 1221 to separate. The second terminal conductive component 12 continues to move until the insulating sheet 34 is lower than the contact on the first terminal conductive component 12. After the reset button is released, the reset link 42 moves in the opposite direction under the action of the compressed reset member 43. Due to the cooling and hardening of the insulating sheet 34 and the combined action of the slot 421 of the reset link 42, the second terminal conductive component 12 no longer moves in the opposite direction with the reset link 42. However, the second terminal guide component moves upward with the reset link 42 under the action of the second terminal elastic member 13 until the second terminal contact 1221 presses against the insulating sheet 34.

[0062] In one embodiment, such as Figure 1 As shown, two terminal interface assemblies 11 are arranged opposite each other along a first direction, two terminal contacts 1221 are arranged opposite each other along a second direction, and two terminal elastic elements 13 are connected to the same side of the housing assembly 5. One of the two terminal elastic elements 13 is in a compressed state, and the other is in a stretched state, resulting in a compact layout. The first direction is the X-axis, the second direction is the Y-axis, and the first and second directions are perpendicular to each other.

[0063] Example 2

[0064] This embodiment also provides a method for using the above-mentioned current transformer anti-open-circuit device, such as... Figure 10 As shown, it includes the following steps:

[0065] S100. Connect the current transformer anti-open circuit device to the current transformer: the two terminal interface components 11 are respectively connected to the two output terminals of the secondary side of the current transformer, and the two signal terminal interface components 31 are respectively connected to the current transformer open circuit signal power supply terminal and the current transformer open circuit signal output terminal.

[0066] S200 When the secondary side of the current transformer is open-circuited and the voltage amplitude generated between the two terminal interface components 11 breaks down the isolation gap between the two terminal contacts 1221, the current transformer anti-open-circuit device switches from the first state to the second state, the two terminal contacts 1221 close and provide a short-circuit loop for the secondary side of the current transformer, and the two signal terminal contacts 3221 close and issue an alarm signal.

[0067] S300. Check whether the current between the two terminal interface components 11 is the same as the secondary current of the current transformer to confirm whether the operation signal of the current transformer anti-open circuit device is correct.

[0068] S400. After confirming that the current transformer's open-circuit protection device has been activated, short-circuit the secondary side of the current transformer, check the secondary side circuit of the current transformer, and eliminate the fault.

[0069] S500: Use reset module 4 to reset the current transformer open circuit protection device.

[0070] When the secondary side of the current transformer is open-circuited, and the voltage amplitude generated between the two terminal interface assemblies 11 breaks down the isolation gap between the two terminal contacts 1221, the current transformer open-circuit protection device switches from the first state to the second state. The two terminal contacts 1221 close, providing a short-circuit loop for the secondary side of the current transformer. The two signal terminal contacts 3221 close and issue an alarm signal, thereby protecting the current transformer and its connected equipment, preventing harm to personnel and equipment, improving safety, and reminding personnel to perform timely maintenance to avoid affecting subsequent work. After maintenance and fault elimination, the current transformer open-circuit protection device can be reset by the reset module 4, enabling reuse and reducing costs.

[0071] Specifically, after the staff arrives at the site, they use a handheld current clamp meter to measure whether the current at the lead wire of the terminal interface assembly 11 is the same as the secondary current of the current transformer, confirming whether the device's action signal is correct. After confirming that the device has indeed acted, the secondary side of the current transformer should be shorted immediately using a jumper wire / piece. Then, the secondary circuit of the current transformer should be checked to eliminate any open circuit faults on the secondary side of the current transformer. After the fault is eliminated, the jumper wire / piece on the secondary side of the current transformer should be removed, and the device should be reset by pressing the reset button on the reset module 4. This process is simple and reliable.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A current transformer anti-open-circuit device, characterized in that, Includes a housing assembly (5), the housing assembly (5) having the following internal features: Two anti-open-circuit terminal modules (1) are provided. Each anti-open-circuit terminal module (1) includes a terminal interface assembly (11) connected to the housing assembly (5), a terminal conductive assembly (12) with its first end connected to the terminal interface assembly (11), and a terminal elastic member (13) with its two ends connected to the terminal conductive assembly (12) and the housing assembly (5) respectively. The second end of the terminal conductive assembly (12) is provided with a terminal contact (1221). Two open-circuit signal terminal modules (3), each open-circuit signal terminal module (3) includes a signal terminal interface component (31) connected to the housing assembly (5) and a first end of a signal terminal conductive component (32) connected to the signal terminal interface component (31). The second end of the signal terminal conductive component (32) is provided with a signal terminal contact (3221). The second end of the first signal terminal conductive component (32) is provided with an extension (3222). The extension (3222) is connected to a signal terminal elastic element (33) and a thermoplastic insulating sheet (34). The other end of the signal terminal elastic element (33) is connected to the housing assembly (5). The reset module (4) has a first terminal conductive component (12) connected to the reset module (4), and the extension (3222) passes through and is movably connected to the slot (421) of the reset module (4). In the first state, the two terminal contacts (1221) are isolated by the insulating sheet (34), and the two signal contacts (3221) are spaced apart. In the second state, the two terminal contacts (1221) and the two signal contacts (3221) are closed respectively. It also includes four fixed shafts (2) fixed to the housing assembly (5), two terminal conductive assemblies (12) are correspondingly arranged and rotatably connected to the two fixed shafts (2), and two signal terminal conductive assemblies (32) are correspondingly arranged and rotatably connected to the other two fixed shafts (2); The terminal conductive assembly (12) includes a terminal flexible conductive element (121) and a terminal conductive sheet (122) connected to the terminal flexible conductive element (121). The terminal flexible conductive element (121) is connected to the terminal interface assembly (11). The terminal conductive sheet (122) is provided with the terminal contact (1221). The terminal conductive sheet (122) is rotatably connected to the fixed shaft (2). The signal terminal conductive component (32) includes a signal terminal flexible conductive element (321) and a signal terminal conductive sheet (322) connected to the signal terminal flexible conductive element (321). The signal terminal flexible conductive element (321) is connected to the signal terminal interface component (31). The signal terminal conductive sheet (322) is provided with the signal terminal contact (3221). The first signal terminal conductive sheet (322) is provided with an extension (3222). The signal terminal conductive sheet (322) is rotatably connected to the fixed shaft (2).

2. The current transformer anti-open-circuit device according to claim 1, characterized in that, Both the terminal interface assembly (11) and the signal terminal interface assembly (31) include a fastener (111) connected to the housing assembly (5) and a base (112) disposed inside the housing assembly (5). An interface is formed between the end of the fastener (111) and the base (112), and the housing assembly (5) has an opening (523) communicating with the interface.

3. The current transformer anti-open-circuit device according to claim 1, characterized in that, The reset module (4) includes an operating element (41) and a reset link (42) slidably connected to the housing assembly (5). The operating element (41) is disposed on the housing assembly (5), and the reset link (42) is elastically connected to the housing assembly (5). The operating element (41) is connected to the first end of the reset link (42), and the first terminal conductive component (12) is connected to the second end of the reset link (42). The reset link (42) is provided with the slot (421).

4. The current transformer anti-open-circuit device according to any one of claims 1-3, characterized in that, The housing assembly (5) includes a base plate (51) and a cover (52) detachably connected to the base plate (51). The base plate (51) and the cover (52) form a receiving space. The anti-open circuit terminal module (1) and the open circuit signal terminal module (3) are located in the receiving space. The base plate (51) is used to connect with the external structure.

5. The current transformer anti-open-circuit device according to any one of claims 1-3, characterized in that, The two terminal interface assemblies (11) are arranged opposite each other in a first direction, the two terminal contacts (1221) are arranged opposite each other in a second direction, the two terminal elastic elements (13) are connected to the same side of the housing assembly (5), one of the two terminal elastic elements (13) is in a compressed state and the other is in a stretched state.

6. The current transformer anti-open-circuit device according to any one of claims 1-3, characterized in that, The front end of the insulating sheet (34) is in the shape of a fence.

7. The current transformer anti-open-circuit device according to any one of claims 1-3, characterized in that, The housing assembly (5) is provided with an observation port (521), and the extension (3222) is connected to a sign (35), which is exposed in the observation port (521).

8. A method of using a current transformer anti-open-circuit device as described in any one of claims 1-7, characterized in that, include: Connect the current transformer anti-open circuit device to the current transformer: the two terminal interface components (11) are respectively connected to the two output terminals of the secondary side of the current transformer, and the two signal terminal interface components (31) are respectively connected to the power supply terminal of the current transformer open circuit signal and the output terminal of the current transformer open circuit signal. When the secondary side of the current transformer is open-circuited and the voltage amplitude generated between the two terminal interface assemblies (11) breaks down the isolation gap between the two terminal contacts (1221), the current transformer anti-open-circuit device switches from the first state to the second state, the two terminal contacts (1221) close and provide a short-circuit loop for the secondary side of the current transformer, and the two signal terminal contacts (3221) close and issue an alarm signal. Check whether the current between the two terminal interface assemblies (11) is the same as the secondary current of the current transformer, so as to confirm whether the operation signal of the current transformer anti-open circuit device is correct. After confirming that the current transformer anti-open circuit device has been activated, short-circuit the secondary side of the current transformer, check the secondary side circuit of the current transformer, and eliminate the fault. The current transformer anti-open circuit device is reset using the reset module (4).

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